Ariana Grande and Justin Bieber: Surprise Duets at Miami Concert Slay

Justin Bieber made a surprise appearance at Ariana Grande's Honeymoon Tour concert last night in Miami – winning over the crowd as they sang duets of "As Long As You Love Me," "Love Me Harder" and "All That Matters."

Justin teased the special treat, with some seriously vague hints, tweeting: "Where am I?" and "What am I up to? :)" He added, "U guys have been asking for this for a while. Get ready. No one was ready for it though, as the crowd went bananas when Justin joined Ari on stage.

Later, he tweeted: "Thank you @ArianaGrande and thank you Miami. I missed the stage. See u soon ;)"

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